What is the CVSS score of CVE-2026-25921?

CVE-2026-25921 has a CVSS 3.1 base score of 9.3 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:L. EPSS exploitation probability: 0.0%.

Is there a public PoC exploit available for CVE-2026-25921?

Yes, a public proof-of-concept exploit is available for CVE-2026-25921. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2026-25921?

Within 24 hours: Identify all Gogs instances running versions prior to 0.14.2 and assess exposure by reviewing LFS usage across repositories. Within 7 days: Apply vendor patch to upgrade all affected Gogs instances to version 0.14.2 or later, with validated testing in non-production environments first. Within 30 days: Conduct forensic review of LFS object change logs and Git commit history to detect any unauthorized modifications, and implement access controls restricting LFS object write permissions to authorized users only.

Gogs CVE-2026-25921

CRITICAL

Insufficient Verification of Data Authenticity (CWE-345)

2026-03-05 security-advisories@github.com

GHSA-cj4v-437j-jq4c

Authentication Bypass Gogs Suse

9.3

CVSS 3.1 · GitHub Advisory

View

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

Access

Push malicious LFS object to attacker-controlled repo
Delivery

LFS object stored in shared directory
Exploit

Push legitimate repo with same LFS pointer
Execution

Legitimate repo receives malicious object
Impact

Supply chain compromise via corrupted artifact

Vulnerability Assessment

Weakness	CWE CWE-345 OWASP Top 10:2025 A08:2025 - Software or Data Integrity Failures ASVS 5.0 V15 - Secure Coding and Architecture Data authenticity verification
Exploitation Conditions	Gogs versions before 0.14.2 with LFS enabled and multiple repositories sharing the same LFS object storage directory. Attacker requires ability to push to at least one repository to overwrite LFS objects accessible across all repos.
Impact	CVSS 9.3. Git LFS supply chain attack.
Exploit ScenarioDerived	Overwrite LFS objects to inject malicious files into other repos.

Act Now Prioritize within 24-48h. Why: CRITICAL severity + public POC available.

Patch available 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

Supply chain attack via LFS object overwrite across repos in Gogs before 0.14.2. PoC and patch available.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 22:06 CVSS 9.3

LFS supply chain attack in Gogs.

RemediationAI

Update to 0.14.2.

Affected Packages

go gogs.io/gogs fix: 0.14.2

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in go

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

CWE-345 overwritable LFS objects.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

GitHub Advisory PRIMARY 9.3 CRITICAL

AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:L

SUSE CRITICAL

Primary rating from GitHub Advisory.

CVSS VectorGitHub Advisory

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

None

Integrity

High

Availability

Low

Lifecycle Timeline

PoC Detected

Mar 06, 2026 - 14:02 vuln.today

Public exploit code

Patch released

Mar 06, 2026 - 14:02 nvd

Patch available

CVE Published

Mar 05, 2026 - 19:16 nvd

CRITICAL 9.3

DescriptionGitHub Advisory

Gogs is an open source self-hosted Git service. Prior to version 0.14.2, overwritable LFS object across different repos leads to supply-chain attack, all LFS objects are vulnerable to be maliciously overwritten by malicious attackers. This issue has been patched in version 0.14.2.

Executive ViewAI

Why It Matters

Critical vulnerability in Gogs Git service allows attackers to overwrite shared Large File Storage (LFS) objects across repositories, enabling supply chain attacks that could compromise code integrity and introduce malicious content into multiple projects simultaneously. Organizations using self-hosted Gogs instances are at immediate risk of having their software artifacts poisoned without detection.

Business Impact: Severe

Compensating Controls

Apply vendor patch.

Threat Intelligence Overview

EPSS Score

0.0%

Top 94% exploitable

Exploit

POC

Public exploit code exists

Data Quality

4 sources

Confidence: Medium

NVD

CVE.org

EPSS Vendor

GitHub

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.

SignalValue

Severity CRITICAL

CISA KEV No

Public POC Yes

EPSS 0.0%

Patch available Yes

Active threat No

Deciding rule

CRITICAL severity + public POC available

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Out-of-Cycle

Exploitation· derived

Poc

System Exposure· derived

Open

Automatable· derived

Yes

Human Impact

Very High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +46

PoC: +20

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Authentication Bypass CRITICAL

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

Affected Products (CPE)GitHub Advisory

cpe:2.3:a:gogs:gogs:*:*:*:*:*:*:*:*

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9.3

Vendor StatusVendor

SUSE

Severity: Critical

References

Advisories & patches

PATCH https://github.com/gogs/gogs/commit/81ee8836445ac888d99da8b652be7d5cbc5c4d5c ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:1042/ REF https://github.com/gogs/gogs/pull/8166 REF https://github.com/gogs/gogs/releases/tag/v0.14.2

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