CVE-2026-32891Public exploitNetwork attack vector

Admin takeover via unescaped Jellyseerr usernames

Published Mar 20, 2026 · Updated Mar 20, 2026

Stored XSS in openVESSL Anchorr 1.4.1 and earlier allows remote authenticated users to execute JavaScript in an administrator's browser. populateJellyseerrUserSelect() writes Jellyseerr display names and email addresses into innerHTML without escaping when the Mappings tab loads. Any Jellyseerr account holder can plant the payload, but an Anchorr administrator must open that tab; execution can expose configuration secrets and enable dashboard and integrated-service takeover.

CVSS severity9.0
Critical
EPSS probability0.16%
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 openVESSL Anchorr 1.4.1 and earlier allows remote authenticated users to execute JavaScript in an administrator's browser. populateJellyseerrUserSelect() writes Jellyseerr display names and email addresses into innerHTML without escaping when the Mappings tab loads. Any Jellyseerr account holder can plant the payload, but an Anchorr administrator must open that tab; execution can expose configuration secrets and enable dashboard and integrated-service takeover.

The record

CVE
CVE-2026-32891
Published
Mar 20, 2026
Updated
Mar 20, 2026
Vendor
openVESSL
Product
Anchorr
Classifications
CWE-80, CWE-212, CWE-311, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 20, 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=< 1.4.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

openVESSL · Anchorrversion=< 1.4.2

Published CVSS scores

9.0GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

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-80Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
CWE-212Improper Removal of Sensitive Information Before Storage or Transfer
CWE-311Missing Encryption of Sensitive Data
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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