What is the CVSS score of CVE-2026-27973?

CVE-2026-27973 has a CVSS 3.1 base score of 4.0 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:L/I:L/A:N. EPSS exploitation probability: 0.0%.

Which versions of Audiobookshelf Mobile App are affected by CVE-2026-27973?

Organizations using versions should be aware of moderate risk from CVE-2026-27973, a cross-site scripting vulnerability rated CVSS 4.0.. A patch is available.

Audiobookshelf Mobile App CVE-2026-27973

MEDIUM

Cross-site Scripting (XSS) (CWE-79)

2026-02-26 security-advisories@github.com

XSS Audiobookshelf Mobile App Audiobookshelf

4.0

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

4.0 MEDIUM

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

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

High

Privileges Required

High

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:55 vuln.today

Patch released

Mar 12, 2026 - 20:26 nvd

Patch available

CVE Published

Feb 26, 2026 - 02:16 nvd

MEDIUM 4.0

DescriptionGitHub Advisory

Audiobookshelf is a self-hosted audiobook and podcast server. A stored cross-site scripting (XSS) vulnerability exists in versions prior to 0.12.0-beta of the Audiobookshelf mobile application that allows arbitrary JavaScript execution through malicious library metadata. Attackers with library modification privileges can execute code in victim users' browsers/WebViews, potentially leading to session hijacking, data exfiltration, and unauthorized access to native device APIs. The issue is fixed in audiobookshelf-app version 0.12.0-beta, corresponding to audiobookshelf version 2.12.0.

AnalysisAI

Stored XSS in Audiobookshelf Mobile App prior to version 0.12.0-beta allows authenticated users with library modification privileges to inject malicious JavaScript through metadata, enabling arbitrary code execution within victim users' browsers and WebViews. Successful exploitation could lead to session hijacking, data theft, and unauthorized access to native device APIs. …

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Vulnerability AssessmentAI

Risk Assessment	CVSS 4.0 (MEDIUM). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	An attacker without authentication could exploit this flaw, session hijacking, data exfiltration, and unauthorized acces.
Remediation	A vendor patch is available — apply it immediately. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 30 days: Identify affected systems running versions and apply vendor patches as part of regular patch cycle. …

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CVE-2026-27973 vulnerability details – vuln.today

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