CVE-2026-25736Public exploitNetwork attack vector

Stored XSS via unencoded custom RSE attributes

Published Feb 25, 2026 · Updated Feb 25, 2026

Stored XSS in the Rucio WebUI allows remote authenticated users to execute JavaScript through a crafted custom RSE attribute. The backend stores the custom attribute value, and the RSE Management view inserts it into the DOM without output encoding. High-privileged access is required to add the attribute, and a victim must view the affected RSE page; the script can read exposed session tokens or issue WebUI requests as that victim.

CVSS severity6.1
Medium
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Stored XSS in the Rucio WebUI allows remote authenticated users to execute JavaScript through a crafted custom RSE attribute. The backend stores the custom attribute value, and the RSE Management view inserts it into the DOM without output encoding. High-privileged access is required to add the attribute, and a victim must view the affected RSE page; the script can read exposed session tokens or issue WebUI requests as that victim.

The record

CVE
CVE-2026-25736
Published
Feb 25, 2026
Updated
Feb 25, 2026
Vendor
Rucio
Product
Rucio
Classifications
CWE-79, CWE-1004, T1539
Attack vector
network
Privileges
admin

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 privilegesadmin

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

6.1GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:N
4.8NIST NVDCVSS: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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

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

Public exploit references

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo