CVE-2021-25017Public exploitNetwork attack vector

Reflected XSS via unescaped announcement search attribute

Published Jan 24, 2022 · Updated Aug 3, 2024

Reflected XSS in Themeum Tutor LMS before 1.9.12 allows remote attackers to execute script in an administrator's browser. The announcements admin page writes the search query into an HTML attribute without attribute escaping, allowing quotation marks to introduce event-handler markup. The victim must be signed in to WordPress and open an attacker-crafted URL; the script then runs with the victim's browser access to the site.

CVSS severity6.1
Medium
EPSS probability1.00%
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 Themeum Tutor LMS before 1.9.12 allows remote attackers to execute script in an administrator's browser. The announcements admin page writes the search query into an HTML attribute without attribute escaping, allowing quotation marks to introduce event-handler markup. The victim must be signed in to WordPress and open an attacker-crafted URL; the script then runs with the victim's browser access to the site.

The record

CVE
CVE-2021-25017
Published
Jan 24, 2022
Updated
Aug 3, 2024
Vendor
Themeum
Product
Tutor LMS
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 24, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.9.12 <1.9.12

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Themeum · Tutor LMSversion=1.9.12 <1.9.12

Published CVSS scores

4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
6.1NIST NVDCVSS: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-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript

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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