CVE-2022-30999Network attack vector

Stored cross-site scripting via unsanitized SVG uploads

Published May 25, 2022 · Updated Apr 22, 2025

Cross-site scripting in Friends of Flarum FoF Upload before 1.2.3 allows remote authenticated users to execute JavaScript via an SVG URI. The upload pipeline stores SVG content without sanitizing embedded scripts, so direct navigation serves attacker-controlled active content to another user's browser. Exploitation requires SVG uploads to be enabled, upload permission for the attacker, and a victim to open the stored SVG directly; successful code runs in that user's web context and can read or modify reachable data.

CVSS severity8.7
High
EPSS probability1.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Friends of Flarum FoF Upload before 1.2.3 allows remote authenticated users to execute JavaScript via an SVG URI. The upload pipeline stores SVG content without sanitizing embedded scripts, so direct navigation serves attacker-controlled active content to another user's browser. Exploitation requires SVG uploads to be enabled, upload permission for the attacker, and a victim to open the stored SVG directly; successful code runs in that user's web context and can read or modify reachable data.

The record

CVE
CVE-2022-30999
Published
May 25, 2022
Updated
Apr 22, 2025
Vendor
Friends of Flarum
Product
FoF Upload
Classifications
CWE-79, T1189
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 25, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 22, 2025Record 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=< 1.2.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Friends of Flarum · FoF Uploadversion=< 1.2.3

Published CVSS scores

5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:P/A:N
8.7GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/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 exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

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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