CVE-2026-25136Public exploitNetwork attack vector

Session-token theft via unencoded error-message HTML

Published Feb 25, 2026 · Updated Feb 25, 2026

Reflected XSS in affected Rucio WebUI releases allows remote attackers to steal session tokens through crafted error-triggering URLs. The server places user-controlled values in ExceptionMessage, and client scripts pass that text to jQuery.html(...) instead of encoding it or inserting it as text. An authenticated WebUI user must follow the crafted link; injected JavaScript then runs in the WebUI origin and can read the non-HttpOnly session token.

CVSS severity8.1
High
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in affected Rucio WebUI releases allows remote attackers to steal session tokens through crafted error-triggering URLs. The server places user-controlled values in ExceptionMessage, and client scripts pass that text to jQuery.html(...) instead of encoding it or inserting it as text. An authenticated WebUI user must follow the crafted link; injected JavaScript then runs in the WebUI origin and can read the non-HttpOnly session token.

The record

CVE
CVE-2026-25136
Published
Feb 25, 2026
Updated
Feb 25, 2026
Vendor
Rucio
Product
Rucio
Classifications
CWE-1004, CWE-79, T1539, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=< 35.8.3
  2. Affected versionversion=>= 36.0.0rc1, < 38.5.4
  3. Affected versionversion=>= 39.0.0rc1, < 39.3.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Rucio · Rucioversion=< 35.8.3; version=>= 36.0.0rc1, < 38.5.4; version=>= 39.0.0rc1, < 39.3.1

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
8.1GitHub CNACVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-1004Sensitive Cookie Without 'HttpOnly' Flag
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1539Steal Web Session Cookie
T1189Drive-by Compromise

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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