CVE-2026-42887Public exploitNetwork attack vector

Credential capture via unsanitized login message

Published May 11, 2026 · Updated May 11, 2026

Stored XSS in Audiobookshelf before 2.33.0 allows remote authenticated users to capture credentials from users who visit the login page. The login view inserts authLoginCustomMessage from /api/auth-settings into the page with v-html without escaping or sanitizing its HTML. Administrative privileges are required to save the payload, and execution occurs when a logged-out user loads the login form, exposing entered usernames and passwords.

CVSS severity4.5
Medium
EPSS probability0.21%
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 Audiobookshelf before 2.33.0 allows remote authenticated users to capture credentials from users who visit the login page. The login view inserts authLoginCustomMessage from /api/auth-settings into the page with v-html without escaping or sanitizing its HTML. Administrative privileges are required to save the payload, and execution occurs when a logged-out user loads the login form, exposing entered usernames and passwords.

The record

CVE
CVE-2026-42887
Published
May 11, 2026
Updated
May 11, 2026
Vendor
advplyr
Product
Audiobookshelf
Classifications
T1056.002
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. May 11, 2026CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=< 2.33.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

advplyr · Audiobookshelfversion=< 2.33.0

Published CVSS scores

4.5GitHubCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:N/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.

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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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1056.002Input Capture: GUI Input Capture

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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