Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain
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AccessCreate malicious website with embedded code
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ExploitRobot Runtime user navigates to site
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ExecutionPega Browser Extension executes malicious payload
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ImpactArbitrary files written to system
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A01:2025 - Broken Access Control
ASVS 5.0
V8 - Authorization Access control enforcement
MITRE ATT&CK
1 technique across 1 tactic: Defense Evasion The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Exploitation Conditions | Requires Pega Robotic Automation version 22.1 or R25 with Pega Browser Extension installed in Google Chrome or Microsoft Edge. A Robot Runtime user must navigate to an attacker-controlled malicious website. No authentication required; victim interaction (visiting website) is necessary. |
| Impact | The 7.2 CVSS score reflects genuine risk but requires careful contextualization. The network attack vector (AV:N) and low attack complexity (AC:L) indicate ease of exploitation once conditions are met, but the attack requires present attack timing (AT:P) and user interaction (UI:P), meaning users must actively navigate to malicious sites during automation execution. No EPSS score is available for this 2026 CVE, and no confirmed active exploitation (not in CISA KEV) or public proof-of-concept exists. The real-world risk is moderate: while the technical barrier is low for attackers to create malicious sites, successful exploitation depends on social engineering Robot Runtime users during specific operational windows. Organizations using Pega RPA in production environments face meaningful risk because compromised automation systems could enable persistent access, data exfiltration, or disruption of business processes. The high subsequent system integrity and availability impacts suggest potential for lateral movement or operational disruption beyond initial file write. This warrants priority attention for organizations actively using affected Pega RPA versions, particularly in environments where Robot Runtime users have broad system access. |
| Exploit ScenarioDerived | An attacker creates a convincing phishing site or compromises a legitimate website that Robot Runtime users might visit during their automation workflows. When a user running Pega Robotic Automation navigates to this malicious site using Chrome or Edge with the Pega Browser Extension active, the attacker's embedded JavaScript exploits the improper access control to write arbitrary files to the victim's system. The attacker could plant malicious executables in startup folders, overwrite configuration files to establish persistence, or modify automation scripts to exfiltrate sensitive data processed by future RPA tasks. Given the high subsequent system impact ratings, successful exploitation could enable the attacker to compromise the entire RPA infrastructure and potentially pivot to connected enterprise systems. |
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Alert meAnalysisAIv1 – Apr 07, 2026
Arbitrary file write in Pega Browser Extension allows remote attackers to compromise system integrity when Robot Runtime users visit malicious websites while running automations in Chrome or Edge. Affects Pega Robotic Automation versions 22.1 and R25. Attack requires user interaction (navigating to attacker-controlled site) but no authentication. No public exploit identified at time of analysis, though attack complexity is low once user visits malicious site.
RemediationAI
Organizations should immediately consult the Pega Security Advisory A26 available at https://support.pega.com/support-doc/pega-security-advisory-a26-vulnerability-remediation-note for vendor-released patches and upgrade guidance. Patch available per vendor advisory, though exact remediated version numbers are not specified in available data. As an interim mitigation, restrict Robot Runtime user access to only trusted, verified websites during automation execution through browser policy controls, network filtering, or allowlist-based access restrictions. Implement additional monitoring for unexpected file system modifications on systems running Pega robotic automations. Review and limit file system permissions available to the Pega Browser Extension and Robot Runtime processes using principle of least privilege. Consider isolating RPA environments on dedicated systems or virtual machines with restricted network access until patches are deployed.
Affected VersionsENISA
Affected Packages
Source: OSV (Open Source Vulnerabilities)
Affects your stack
Affects 1 package in euvd
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
This vulnerability stems from CWE-284 (Improper Access Control) in the Pega Browser Extension component that bridges Pega Robot Studio automations with web browsers. The PBE runs with elevated privileges to enable robotic process automation tasks in Chrome and Edge browsers. The improper access control allows malicious websites to exploit the extension's file system interaction capabilities, writing arbitrary files to locations that should be protected. This represents a classic browser extension security failure where insufficient origin validation or sandboxing permits hostile web content to abuse extension APIs. The CVSS 4.0 vector shows high integrity and availability impact on the vulnerable system (VI:H, VA:H) and subsequent system impacts (SI:H, SA:H), indicating potential for system-wide compromise beyond just the browser context.
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Severity by source
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:H/VA:H/SC:N/SI:H/SA:H
Primary rating from Vendor (Pega) · only source for this CVE.
CVSS VectorVendor: Pega
DescriptionCVE.org
An arbitrary file-write vulnerability in Pega Browser Extension (PBE) affects Pega Robotic Automation version 22.1 or R25 users who are running automations that work with Google Chrome or Microsoft Edge. A bad actor could create a website that includes malicious code. The vulnerability could occur if a Robot Runtime user navigates to the malicious website.
Executive ViewAI
CVE-2026-1078 affects Pega Robotic Automation users via a browser extension vulnerability that enables arbitrary file writes when users visit malicious websites during automation tasks. This creates direct system integrity risk for organizations running Pega RPA in Chrome or Edge environments, potentially allowing attackers to modify or inject files on affected systems without authentication. Immediate inventory and access restriction measures are critical given the lack of available vendor patches.
No vendor-released patch identified at time of analysis. Interim mitigations: (1) Disable Pega Browser Extension on systems where feasible and use alternative execution methods; (2) Restrict Robot Runtime user access to approved, internal websites only during automation execution; (3) Isolate RPA systems on network segments with egress filtering to prevent access to external or untrusted domains; (4) Implement application whitelisting to restrict file write operations from browser processes; (5) Monitor and alert on unexpected file modifications in directories accessible to Robot Runtime processes; (6) Escalate vendor support request for emergency patch timeline or workaround guidance.
Threat Intelligence Overview
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.
EUVD-2026-19638
NVD
CVE.org
EPSS
Vulnrichment
GitHub PoC
Exploit-DB