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CVE-2026-55437— Coder vulnerable to stored HTML injection via workspace agent logs in AgentLogLine component

Quick assessment

Affected
coder coder
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Coder是Coder组织开源的一个可以在公共或私有云基础设施中设置开发环境的应用程序。 Coder存在跨站脚本漏洞，该漏洞源于AgentLogLine仪表板组件在实例化ansi-to-html时未设置escapeXML: true，且服务端清理未中和HTML元字符，导致嵌入工作区代理日志行中的HTML呈现为活动标记，容易受到跨站脚本攻击。以下版本受到影响：2.29.17之前版本、2.30.0至2.32.7之前版本、2.33.0至2.33.8之前版本和2.34.0至2.34.2之前版本。

CVSS 5.4 · Medium EPSS 0.32% · P22

Affected Version Matrix 4

VendorProduct Version RangeStatus
coder coder >= 2.34.0, < 2.34.2 affected
>= 2.33.0, < 2.33.8 affected
>= 2.30.0, < 2.32.7 affected
< 2.29.17 affected
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I. Basic Information for CVE-2026-55437

Vulnerability Information
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Vulnerability Title
Coder vulnerable to stored HTML injection via workspace agent logs in AgentLogLine component
Source: CVE Program / CVE List V5
Vulnerability Description
Coder allows organizations to provision remote development environments via Terraform. Prior to versions 2.29.17, 2.32.7, 2.33.8, and 2.34.2, the `AgentLogLine` dashboard component instantiated `ansi-to-html` without `escapeXML: true` and inserted the result via `dangerouslySetInnerHTML` so HTML embedded in workspace agent log lines was rendered as live markup. Server-side sanitization did not neutralize HTML metacharacters. Exploitation requires a victim to view attacker-controlled agent logs in the dashboard. The fix in versions 2.29.17, 2.32.7, 2.33.8, and 2.34.2 enables `escapeXML: true` so HTML metacharacters are escaped before DOM insertion. No known workarounds are available.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Coder 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Coder是Coder组织开源的一个可以在公共或私有云基础设施中设置开发环境的应用程序。 Coder存在跨站脚本漏洞，该漏洞源于AgentLogLine仪表板组件在实例化ansi-to-html时未设置escapeXML: true，且服务端清理未中和HTML元字符，导致嵌入工作区代理日志行中的HTML呈现为活动标记，容易受到跨站脚本攻击。以下版本受到影响：2.29.17之前版本、2.30.0至2.32.7之前版本、2.33.0至2.33.8之前版本和2.34.0至2.34.2之前版本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
coder coder >= 2.34.0, < 2.34.2 -

II. Public POCs for CVE-2026-55437

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III. Intelligence Information for CVE-2026-55437

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Patches & Fixes for CVE-2026-55437 (1)

Vendor Advisories for CVE-2026-55437 (1)

Vendor Pages for CVE-2026-55437 (4)

Same Patch Batch · coder · 2026-07-08 · 8 CVEs total

CVE-2026-55429 8.7 HIGH Coder's workspace app upsert allows cross-workspace agent rebinding via user-controlled ap
CVE-2026-55431 7.7 HIGH Coder's session token leaked to arbitrary hosts via `coder open app` for external workspac
CVE-2026-55436 7.4 HIGH Coder's AI Bridge Proxy skips TLS certificate verification in default configuration
CVE-2026-55438 5.8 MEDIUM Coder's workspace app CORS origin check can be bypassed via UUID-based subdomain spoofing
CVE-2026-55430 5.8 MEDIUM Coder's subdomain workspace app routing trusts unauthenticated X-Forwarded-Host header, en
CVE-2026-55432 5.4 MEDIUM Coder's sub-agent app registration bypasses template port-sharing policy enforcement
CVE-2026-55433 5.4 MEDIUM Coder: Devcontainer recreate endpoint missing write authorization allows read-only roles t

IV. Related Vulnerabilities

Same product: coder
Same vendor: coder
Same weakness: CWE-79

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