CVE-2021-24409Public exploitNetwork attack vector

Administrator-context script execution via unescaped tab parameter

Published Jul 12, 2021 · Updated Aug 3, 2024

Reflected XSS in Jeff Starr Prismatic before 2.8 allows remote attackers to run script in a logged-in administrator's browser. The plugin writes the unescaped tab GET parameter into an HTML attribute on its settings interface. Exploitation requires an administrator to be logged in and follow a crafted network request; script runs with that administrator's browser privileges.

CVSS severity6.1
Medium
EPSS probability1.72%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in Jeff Starr Prismatic before 2.8 allows remote attackers to run script in a logged-in administrator's browser. The plugin writes the unescaped tab GET parameter into an HTML attribute on its settings interface. Exploitation requires an administrator to be logged in and follow a crafted network request; script runs with that administrator's browser privileges.

The record

CVE
CVE-2021-24409
Published
Jul 12, 2021
Updated
Aug 3, 2024
Vendor
Jeff Starr
Product
Prismatic
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 12, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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=2.8 <2.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Jeff Starr · Prismaticversion=2.8 <2.8

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

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

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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