CVE-2021-24879Public exploitNetwork attack vector

Stored script execution via forged ticket filter

Published Feb 7, 2022 · Updated Aug 3, 2024

Stored cross-site scripting in PSM Web Solutions SupportCandy before 2.2.7 allows remote attackers to execute script in a dashboard user's browser. The wpsc_tickets AJAX action accepts a set_custom_filter request without a CSRF check, stores an unsanitized custom_filter[s] value in the victim's cookies, and renders it without escaping. Exploitation requires social engineering of a logged-in user with ticket-list access; the payload executes when that user opens the ticket dashboard.

CVSS severity8.8
High
EPSS probability0.61%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in PSM Web Solutions SupportCandy before 2.2.7 allows remote attackers to execute script in a dashboard user's browser. The wpsc_tickets AJAX action accepts a set_custom_filter request without a CSRF check, stores an unsanitized custom_filter[s] value in the victim's cookies, and renders it without escaping. Exploitation requires social engineering of a logged-in user with ticket-list access; the payload executes when that user opens the ticket dashboard.

The record

CVE
CVE-2021-24879
Published
Feb 7, 2022
Updated
Aug 3, 2024
Vendor
PSM Web Solutions PVT LTD
Product
SupportCandy
Classifications
CWE-352, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 7, 2022CVE 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=2.2.7 <2.2.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

PSM Web Solutions PVT LTD · SupportCandyversion=2.2.7 <2.2.7

Published CVSS scores

6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
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.

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-352Cross-Site Request Forgery (CSRF)
T1204.001User Execution: Malicious Link

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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