CVE-2021-31862Public exploitNetwork attack vector

Unauthenticated reflected XSS via unencoded stamp parameter

Published Oct 29, 2021 · Updated Aug 3, 2024

Reflected XSS in SysAid 20.4.74 allows remote attackers to execute script in a user's browser through an unauthenticated request. KeepAlive.jsp reflects the stamp query value without neutralizing script markup, so a crafted URL injects executable browser code. No account is required, but a user must follow the crafted URL; execution occurs in the SysAid origin and permits access to browser-accessible data.

CVSS severity6.1
Medium
EPSS probability3.98%
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 SysAid 20.4.74 allows remote attackers to execute script in a user's browser through an unauthenticated request. KeepAlive.jsp reflects the stamp query value without neutralizing script markup, so a crafted URL injects executable browser code. No account is required, but a user must follow the crafted URL; execution occurs in the SysAid origin and permits access to browser-accessible data.

The record

CVE
CVE-2021-31862
Published
Oct 29, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 29, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

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')
T1203Exploitation for Client Execution

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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