CVE-2021-32852Public exploitNetwork attack vector

Client-side code execution via unescaped backslash

Published Feb 20, 2023 · Updated Mar 10, 2025

Cross-site scripting in Countly Server Community Edition before 21.11 allows remote authenticated users to execute script in a victim's browser. The reset.html template embeds message and password_min query parameters inside a JavaScript string; HTML escaping leaves backslashes unescaped, so crafted values break out of the string. An attacker account and victim navigation to a malicious link are required, after which injected script runs in the victim's Countly browser context.

CVSS severity5.4
Medium
EPSS probability0.93%
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 Countly Server Community Edition before 21.11 allows remote authenticated users to execute script in a victim's browser. The reset.html template embeds message and password_min query parameters inside a JavaScript string; HTML escaping leaves backslashes unescaped, so crafted values break out of the string. An attacker account and victim navigation to a malicious link are required, after which injected script runs in the victim's Countly browser context.

The record

CVE
CVE-2021-32852
Published
Feb 20, 2023
Updated
Mar 10, 2025
Vendor
Countly
Product
Countly Server
Classifications
CWE-79, T1204.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 20, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 10, 2025Record 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=21.11 <21.11

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Countly · Countly Serverversion=21.11 <21.11

Published CVSS scores

5.4GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
9.0NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

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 exploitPublished

Weakness, pattern, technique

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