CVE-2026-55437Public exploitNetwork attack vector

Stored HTML injection via unescaped agent logs

Published Jul 8, 2026 · Updated Jul 8, 2026

Stored HTML injection in Coder allows remote authenticated users with workspace-owner access to alter dashboard content through agent logs. The AgentLogLine component passes ansi-to-html output created without escapeXML enabled into dangerouslySetInnerHTML, rendering log-supplied HTML as live markup. Exploitation requires another user to view the workspace page; CSP blocks inline scripts, but redirects, UI redressing, CSS-based data exposure, and image beacons remain possible.

CVSS severity5.4
Medium
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored HTML injection in Coder allows remote authenticated users with workspace-owner access to alter dashboard content through agent logs. The AgentLogLine component passes ansi-to-html output created without escapeXML enabled into dangerouslySetInnerHTML, rendering log-supplied HTML as live markup. Exploitation requires another user to view the workspace page; CSP blocks inline scripts, but redirects, UI redressing, CSS-based data exposure, and image beacons remain possible.

The record

CVE
CVE-2026-55437
Published
Jul 8, 2026
Updated
Jul 8, 2026
Vendor
Coder
Product
Coder
Classifications
CWE-79
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 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=< 2.29.17
  2. Affected versionversion=>= 2.30.0, < 2.32.7
  3. Affected versionversion=>= 2.33.0, < 2.33.8
  4. Affected versionversion=>= 2.34.0, < 2.34.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Coder · Coderversion=< 2.29.17; version=>= 2.30.0, < 2.32.7; version=>= 2.33.0, < 2.33.8; version=>= 2.34.0, < 2.34.2

Published CVSS scores

5.4GitHubCVSS: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')

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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