CVE-2024-27730Public exploitNetwork attack vector

Event impersonation via user-controlled contact identifier

Published Aug 15, 2024 · Updated Aug 16, 2024

Authorization bypass in Friendica 2023.12 allows remote attackers to publish a calendar event as another local user via its cid parameter. The event-edit handler accepts a submitted cid value for an existing event and persists it without binding the contact identifier to the editor. A crafted edit that zeroes the field reshares the event under another user's identity; the upstream patch does not substantiate code execution.

CVSS severity9.8
Critical
EPSS probability0.80%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization bypass in Friendica 2023.12 allows remote attackers to publish a calendar event as another local user via its cid parameter. The event-edit handler accepts a submitted cid value for an existing event and persists it without binding the contact identifier to the editor. A crafted edit that zeroes the field reshares the event under another user's identity; the upstream patch does not substantiate code execution.

The record

CVE
CVE-2024-27730
Published
Aug 15, 2024
Updated
Aug 16, 2024
Vendor
Friendica
Product
Friendica
Classifications
CWE-639, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 15, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 16, 2024Record 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=2023.12

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Friendica · Friendicaversion=2023.12

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

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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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-639Authorization Bypass Through User-Controlled Key
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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