CVE-2025-13512Network attack vector

Script execution via unescaped PHP_SELF form action

Published Dec 5, 2025 · Updated Apr 8, 2026

Reflected XSS in Jiang Xin CoSign Single Signon 0.3.1 and earlier allows remote attackers to inject scripts through crafted request paths. The plugin writes $_SERVER['PHP_SELF'] into a form action at cosign-sso.php line 423 without sanitizing the request path or escaping the HTML attribute. Exploitation requires a user to follow an attacker-controlled link, after which the injected script executes in that user's browser context.

CVSS severity6.1
Medium
EPSS probability0.25%
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 Jiang Xin CoSign Single Signon 0.3.1 and earlier allows remote attackers to inject scripts through crafted request paths. The plugin writes $_SERVER['PHP_SELF'] into a form action at cosign-sso.php line 423 without sanitizing the request path or escaping the HTML attribute. Exploitation requires a user to follow an attacker-controlled link, after which the injected script executes in that user's browser context.

The record

CVE
CVE-2025-13512
Published
Dec 5, 2025
Updated
Apr 8, 2026
Vendor
Jiang Xin
Product
CoSign Single Signon
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 5, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 8, 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 <=0.3.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Jiang Xin · CoSign Single Signonversion=0 <=0.3.1

Published CVSS scores

6.1WordfenceCVSS:3.1/AV:N/AC:L/PR:N/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.

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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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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