CVE-2024-1691Network attack vector

Stored XSS via unsanitized SVG form upload

Published Mar 13, 2024 · Updated Apr 8, 2026

Stored XSS in Themeisle Otter Blocks 2.6.3 and earlier allows remote attackers to inject scripts through SVG form uploads. The Form Block accepts uploaded SVG content without sufficient sanitization, and affected output paths render embedded script without adequate escaping. No account is required to submit the file, but a user must open an injected page for the script to execute in that page's browser context.

CVSS severity6.1
Medium
EPSS probability0.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Themeisle Otter Blocks 2.6.3 and earlier allows remote attackers to inject scripts through SVG form uploads. The Form Block accepts uploaded SVG content without sufficient sanitization, and affected output paths render embedded script without adequate escaping. No account is required to submit the file, but a user must open an injected page for the script to execute in that page's browser context.

The record

CVE
CVE-2024-1691
Published
Mar 13, 2024
Updated
Apr 8, 2026
Vendor
Themeisle
Product
Otter Blocks
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 13, 2024CVE publishedPublication date reported by the CVE source.
  2. Apr 8, 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 <=2.6.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Themeisle · Otter Blocksversion=0 <=2.6.3

Published CVSS scores

6.1WordfenceCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/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.

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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 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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