CVE-2026-27974Public exploitNetwork attack vector

JavaScript execution via unsanitized marquee metadata

Published Feb 26, 2026 · Updated Feb 26, 2026

Stored XSS in advplyr Audiobookshelf Mobile App before 0.12.0-beta allows attackers to execute JavaScript through library metadata. WrappingMarquee.startScroll assigns book, podcast, or chapter titles directly to innerHTML, causing the WebView to parse attacker-controlled metadata as markup. Exploitation requires a victim to play the item and a title long enough to trigger scrolling; the resulting script can read session tokens and invoke accessible native APIs.

CVSS severity4.8
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in advplyr Audiobookshelf Mobile App before 0.12.0-beta allows attackers to execute JavaScript through library metadata. WrappingMarquee.startScroll assigns book, podcast, or chapter titles directly to innerHTML, causing the WebView to parse attacker-controlled metadata as markup. Exploitation requires a victim to play the item and a title long enough to trigger scrolling; the resulting script can read session tokens and invoke accessible native APIs.

The record

CVE
CVE-2026-27974
Published
Feb 26, 2026
Updated
Feb 26, 2026
Vendor
advplyr
Product
Audiobookshelf Mobile App
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.12.0-beta

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

advplyr · Audiobookshelf Mobile Appversion=< 0.12.0-beta

Published CVSS scores

4.8GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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