Security readout for executives and security teams
Plain-English summary
CVE-2011-4903 is a cross-site scripting issue in older TYPO3 releases. A remote attacker could inject web script or HTML through TYPO3's RemoveXSS function. The sources identify fixed TYPO3 versions, but provide no CVSS score and no evidence of active exploitation.
Executive priority
Treat this as a legacy CMS hygiene issue with moderate urgency. The main business concern is old TYPO3 deployments still reachable by users or the internet.
Technical view
TYPO3 before 4.3.12, 4.4.x before 4.4.9, and 4.5.x before 4.5.4 is reported vulnerable to XSS via the RemoveXSS function. The record does not provide CWE, CVSS, exploitability metrics, or detailed attack preconditions.
Likely exposure
Exposure is most likely on public or internal sites still running the affected TYPO3 4.3, 4.4, or 4.5 branches below the fixed versions.
Exploitation context
The bundle says remote attackers can inject arbitrary web script or HTML. It does not cite known exploited status, and CISA KEV is false.
Researcher notes
Evidence is limited to the CVE description, TYPO3 advisory reference, and Debian tracker reference. The bundle does not include payload details, root cause analysis, CVSS, or active exploitation evidence.
Mitigation direction
- Upgrade TYPO3 4.3 systems to 4.3.12 or later if applicable.
- Upgrade TYPO3 4.4 systems to 4.4.9 or later if applicable.
- Upgrade TYPO3 4.5 systems to 4.5.4 or later if applicable.
- Check TYPO3 advisory guidance for any branch-specific instructions.
- Prioritize externally reachable TYPO3 instances first.
Validation and detection
- Inventory TYPO3 instances and record exact version numbers.
- Identify systems below 4.3.12, 4.4.9, or 4.5.4.
- Confirm whether affected instances expose public content or authenticated workflows.
- Review TYPO3 advisory and Debian tracker status for your deployed packages.
- After upgrade, verify the running TYPO3 version reports the fixed release.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2011-4903 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://security-tracker.debian.org/tracker/CVE-2011-4903CVE reference · x_refsource_MISC
- https://typo3.org/security/advisory/typo3-core-sa-2011-001/#XSSCVE reference · x_refsource_CONFIRM
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.