CVE-2026-73629Public exploitNetwork attack vector

Authenticated internal-service disclosure via alternate address formats

Published Aug 13, 2026 · Updated Aug 13, 2026

Server-side request forgery in Serendipity before 2.6.0 allows remote authenticated users to read internal HTTP response bodies. serendipity_url_allowed() checks only dotted-decimal IPv4 and lets hex IPv4, IPv6 literals, and omitted link-local ranges reach the media URL fetcher. An account with adminImagesAdd permission can save a reachable service's response under the public uploads directory, exposing its contents.

CVSS severity8.4
High
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Server-side request forgery in Serendipity before 2.6.0 allows remote authenticated users to read internal HTTP response bodies. serendipity_url_allowed() checks only dotted-decimal IPv4 and lets hex IPv4, IPv6 literals, and omitted link-local ranges reach the media URL fetcher. An account with adminImagesAdd permission can save a reachable service's response under the public uploads directory, exposing its contents.

The record

CVE
CVE-2026-73629
Published
Aug 13, 2026
Updated
Aug 13, 2026
Vendor
Serendipity Team
Product
Serendipity
Classifications
CWE-918, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 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=0 <2.6.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Serendipity Team · Serendipityversion=0 <2.6.0

Published CVSS scores

8.4VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:H/SI:L/SA:N
8.5VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/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 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 exploitPublished

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1190Exploit Public-Facing Application

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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