CVE-2023-26846Network attack vector

Script execution via stored candidate city value

Published Apr 11, 2023 · Updated Feb 11, 2025

Stored XSS in OpenCATS 0.9.7 and earlier allows remote authenticated users to execute scripts through a crafted candidate city value. The candidates handler accepts the city parameter at index.php?m=candidates, stores it without neutralizing HTML or script content, and later renders the value in a user's browser. A valid OpenCATS account is required, and execution depends on another user viewing the poisoned candidate data, exposing that user's session to attacker-controlled browser actions.

CVSS severity5.4
Medium
EPSS probability0.41%
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 OpenCATS 0.9.7 and earlier allows remote authenticated users to execute scripts through a crafted candidate city value. The candidates handler accepts the city parameter at index.php?m=candidates, stores it without neutralizing HTML or script content, and later renders the value in a user's browser. A valid OpenCATS account is required, and execution depends on another user viewing the poisoned candidate data, exposing that user's session to attacker-controlled browser actions.

The record

CVE
CVE-2023-26846
Published
Apr 11, 2023
Updated
Feb 11, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 11, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 11, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.4CISACVSS:3.1/AV:N/AC:L/PR:L/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
Privilegesauthenticated
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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