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phpList 3 CVE-2026-73481

| EUVDEUVD-2026-58228 MEDIUM
Cross-Site Request Forgery (CSRF) (CWE-352)
2026-08-13 VulnCheck GHSA-328j-qh6x-vvjq
PHP CSRF Phplist3
5.3
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
5.3 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
5.4 MEDIUM

Network delivery via crafted URL, no attacker privileges needed, user interaction required; impact limited to deletion of bounce rule records affecting integrity and email processing availability.

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L
4.0 AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
P
Scope
X

Lifecycle Timeline

3
Source Code Evidence Fetched
Aug 13, 2026 - 19:21 vuln.today
Analysis Generated
Aug 13, 2026 - 19:21 vuln.today
CVE Published
Aug 13, 2026 - 18:48 cve.org
MEDIUM 5.3

DescriptionCVE.org

phpList before 3.7.0-RC5 fail to enforce CSRF token validation on the bounce rule deletion endpoint (bouncerules.php / bouncerule.php). The deletion is performed via a GET request (?page=bouncerules&del=N), and the central CSRF check (verifyCsrfGetToken) is invoked with enforce=false, so it only validates the token when a 'tk' parameter is present. A remote attacker can trick an authenticated administrator into loading a crafted URL (e.g., embedded in an image tag) to delete arbitrary bounce rules from the phplist_bounceregex table without a valid CSRF token.

AnalysisAI

Cross-site request forgery in phpList before 3.7.0-RC5 allows a remote, unauthenticated attacker to delete arbitrary bounce rules from a target phpList installation by tricking an authenticated administrator into loading a crafted URL. The deletion endpoint (bouncerules.php) accepts state-changing operations over GET and passes enforce=false to verifyCsrfGetToken, meaning the CSRF token check is only performed when the tk parameter is voluntarily present - effectively disabling the protection entirely. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Recon
Enumerate target phpList admin URL
Delivery
Craft GET deletion URL with target bounce rule ID
Exploit
Embed URL in img src on attacker-controlled page
Install
Phish or lure authenticated admin to load page
C2
Browser sends credentialed GET request
Execute
CSRF check bypassed (enforce=false, no tk param)
Impact
Bounce rule deleted from phplist_bounceregex table
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Vulnerability AssessmentAI

Exploitation The victim must be an authenticated phpList administrator with an active session cookie in their browser at the time they load the attacker-controlled resource. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:L) scores 5.3, reflecting limited integrity and availability impact constrained by the UI:P requirement - the attacker must cause an authenticated administrator to trigger the request. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker identifies a phpList deployment and crafts a URL such as https://target.example.com/lists/admin/?page=bouncerules&del=5 targeting a known or guessed bounce rule ID. The attacker embeds this URL as the src of an invisible img tag in a phishing email or a web forum post and sends it to a phpList administrator. …
Remediation Upgrade phpList 3 to version 3.7.0-RC5 or later; the patching commit is documented at https://github.com/phpList/phplist3/commit/5159c3ed33a5674a8169472b50d146d97f630746 and the release is available at https://github.com/phpList/phplist3/releases/tag/v3.7.0-RC5. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-73481 vulnerability details – vuln.today
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