CVE-2026-26022Public exploitNetwork attack vector

Stored XSS via unrestricted data URI links

Published Mar 5, 2026 · Updated Mar 5, 2026

Stored XSS in Gogs before 0.14.2 allows remote authenticated users to execute JavaScript through crafted issue content. The sanitizer in internal/markup/sanitizer.go permits data:text/html links from raw HTML anchors instead of restricting data URIs to safe image types. Exploitation requires an authenticated account and a victim to click the stored link, after which the script runs in that victim's browser context.

CVSS severity8.7
High
EPSS probability0.31%
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 Gogs before 0.14.2 allows remote authenticated users to execute JavaScript through crafted issue content. The sanitizer in internal/markup/sanitizer.go permits data:text/html links from raw HTML anchors instead of restricting data URIs to safe image types. Exploitation requires an authenticated account and a victim to click the stored link, after which the script runs in that victim's browser context.

The record

CVE
CVE-2026-26022
Published
Mar 5, 2026
Updated
Mar 5, 2026
Vendor
Gogs
Product
Gogs
Classifications
CWE-79, T1204.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 5, 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=< 0.14.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Gogs · Gogsversion=< 0.14.2

Published CVSS scores

8.7GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
5.4NIST NVDCVSS: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.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.001User Execution: Malicious Link

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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