CVE-2026-58487Network attack vector

Stored HTML injection via unescaped display name

Published Jul 13, 2026 · Updated Jul 13, 2026

Stored HTML injection in HedgeDoc 1.10.8 and earlier allows remote authenticated users to alter viewed pages via a crafted email address. Registration accepts a quoted-string email local-part, reuses it as the display name, and renders it unescaped in publish, slide, and editor HTML. Open email registration is required; the injected markup can change page content and embed cross-origin iframes, while CSP blocks straightforward inline script execution.

CVSS severity5.1
Medium
EPSS probability0.49%
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 HedgeDoc 1.10.8 and earlier allows remote authenticated users to alter viewed pages via a crafted email address. Registration accepts a quoted-string email local-part, reuses it as the display name, and renders it unescaped in publish, slide, and editor HTML. Open email registration is required; the injected markup can change page content and embed cross-origin iframes, while CSP blocks straightforward inline script execution.

The record

CVE
CVE-2026-58487
Published
Jul 13, 2026
Updated
Jul 13, 2026
Vendor
HedgeDoc
Product
HedgeDoc
Classifications
CWE-116, CWE-79
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 13, 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=< 1.11.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

HedgeDoc · HedgeDocversion=< 1.11.0

Published CVSS scores

5.1GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:L/SA: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-116Improper Encoding or Escaping of Output
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Public exploit references

No public exploit references are available in this record.

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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