CVE-2021-47907Public exploitNetwork attack vector

Session hijacking via unsanitized support-ticket titles

Published May 10, 2026 · Updated May 10, 2026

Stored cross-site scripting in Rocket Soft Rocket LMS 1.1 allows remote authenticated users to hijack sessions through ticket titles. The support-ticket creation path stores the title parameter without neutralizing embedded HTML and later renders it in message history. A student, instructor, or organization account can submit the payload, which executes when another user or support administrator opens the history and enables session theft or persistent phishing.

CVSS severity5.1
Medium
EPSS probability0.24%
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 Rocket Soft Rocket LMS 1.1 allows remote authenticated users to hijack sessions through ticket titles. The support-ticket creation path stores the title parameter without neutralizing embedded HTML and later renders it in message history. A student, instructor, or organization account can submit the payload, which executes when another user or support administrator opens the history and enables session theft or persistent phishing.

The record

CVE
CVE-2021-47907
Published
May 10, 2026
Updated
May 10, 2026
Vendor
Rocket Soft
Product
Rocket LMS
Classifications
CWE-79, T1539
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 10, 2026CVE publishedPublication date reported by the CVE source.
  2. May 10, 2026Record 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=1.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Rocket Soft · Rocket LMSversion=1.1

Published CVSS scores

6.4VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
5.1VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA: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.

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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')
T1539Steal Web Session Cookie

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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