CVE-2025-51863Public exploitNetwork attack vector

Account hijacking via unsanitized pasted SVG

Published Jul 22, 2025 · Updated Jul 22, 2025

Cross-site scripting in ChatGPT Unli through 2025-05-26 allows remote attackers to steal session cookies via an SVG pasted into chat. The chat interface renders pasted SVG markup without neutralizing its embedded script element, causing the browser to run the payload in the site's origin. Exploitation requires a victim to paste the crafted markup; successful execution exposes session and token cookies and enables account hijacking.

CVSS severity6.1
Medium
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in ChatGPT Unli through 2025-05-26 allows remote attackers to steal session cookies via an SVG pasted into chat. The chat interface renders pasted SVG markup without neutralizing its embedded script element, causing the browser to run the payload in the site's origin. Exploitation requires a victim to paste the crafted markup; successful execution exposes session and token cookies and enables account hijacking.

The record

CVE
CVE-2025-51863
Published
Jul 22, 2025
Updated
Jul 22, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1204
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 22, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 22, 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 privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.1CISA-ADPCVSS: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 exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204User 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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