CVE-2011-1009Public exploitNetwork attack vector

Browser script execution via unsanitized p parameter

Published Feb 5, 2020 · Updated Aug 6, 2024

Cross-site scripting in Vanilla Forums 2.0.17.1 through 2.0.17.5 allows remote attackers to execute script via a crafted p parameter. The index.php request path inserts the p query-string value into the returned page without sanitizing its HTML and script metacharacters. Exploitation requires a victim to open the crafted URL, after which the script runs in the forum origin and can read or alter browser-accessible forum data.

CVSS severity6.1
Medium
EPSS probability0.80%
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 Vanilla Forums 2.0.17.1 through 2.0.17.5 allows remote attackers to execute script via a crafted p parameter. The index.php request path inserts the p query-string value into the returned page without sanitizing its HTML and script metacharacters. Exploitation requires a victim to open the crafted URL, after which the script runs in the forum origin and can read or alter browser-accessible forum data.

The record

CVE
CVE-2011-1009
Published
Feb 5, 2020
Updated
Aug 6, 2024
Vendor
Vanilla Forums
Product
Vanilla Forums
Classifications
CWE-79
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 5, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 6, 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=2.0.17.1 through 2.0.17.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Vanilla Forums · Vanilla Forumsversion=2.0.17.1 through 2.0.17.5

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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')

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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