CVE-2015-8562

HIGHCVSS v2 · 7.57.5—
EchelonGraph scoreLOW confidence

This CVE was only ever scored under CVSS v2.0. NVD CVSS v2.0 base 7.5 — v2 rates that HIGH (v2 bands: LOW 0.0–3.9 / MEDIUM 4.0–6.9 / HIGH 7.0–10.0; v2 has no CRITICAL band). Vector AV:N/AC:L/Au:N/C:P/I:P/A:P. CVSS v2 is an older, coarser metric than v3.1/v4.0 (no Scope, no User Interaction, no Attack Requirements), so it is not directly comparable to a v3 or v4 score. NVD has never re-scored this record under v3. EPSS predicts 98.3% exploitation probability in the next 30 days, which is reflected in EG Risk but does not lift the v2 base. Confidence: LOW.

Sources: epss, nvd_v2
Weaponized
7.5EG
EchelonGraph verdictMitigate this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 98%
  • Public exploit code is available (Metasploit, Exploit-DB (verified), epss top5pct, epss high, public exploit)
CISA-KEV: Not listedEPSS PROB: 98%CVSS v2: 7.5Exploit: Metasploit · Exploit-DB (verified) · epss top5pct · epss high · public exploitExposed services: Not assessed

No fix is confirmed yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for the fix.

Joomla! 1.5.x, 2.x, and 3.x before 3.4.6 allow remote attackers to conduct PHP object injection attacks and execute arbitrary PHP code via the HTTP User-Agent header, as exploited in the wild in December 2015.

CVSS v2.0 (legacy)
7.5HIGHNVD never assigned a CVSS v3 rating to this CVE
EG Score
7.5HIGHlow confidence
EG Risk
78
EG Risk 78/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity75% × 45%
Exploitation98% × 40%
Automatability30% × 15%
CISA SSVC: Track at low, Track or Track* at medium and Track* or Attend at high mission impact.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
98%
EPSS %ILE
99th
KEV
Not listed

CISA SSVCTrack at low, Track or Track* at medium and Track* or Attend at high mission impact.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation public PoC (EG-KEV: weaponized) · Automatable unknown (not published for this CVE) · Technical impact unknown (not published for this CVE). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

December 16, 2015

Last Modified

May 6, 2026

References (18)

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 1× in last 7d / 2× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 4,417 total refreshes for this CVE.

  1. 2026-09-30 09:08 UTCEG score recompute
  2. 2026-09-15 03:05 UTCEPSS rescore
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  7. 2026-07-26 13:55 UTCEG score recompute▲ 7.50
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Publicly available exploits

(9 references)

Working exploit code is in the public domain (1 Metasploit module) (5 GitHub PoCs) (2 Exploit-DB entries). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-38977✓ verified
    First seen Dec 15, 2015

    Joomla! 1.5 < 3.4.5 - Object Injection Remote Command Execution

    Open source ↗
  • Metasploitexploit/multi/http/joomla_http_header_rce✓ verified
    First seen Dec 14, 2015

    Joomla HTTP Header Unauthenticated Remote Code Execution

    Open source ↗
  • GitHub PoCVoidSec/Joomla_CVE-2015-8562
    First seen Sep 17, 2017

    A proof of concept for Joomla's CVE-2015-8562 vulnerability (Object Injection RCE)

    Open source ↗
  • GitHub PoCdmonst3r/CVE-2015-8562
    First seen Jan 8, 2017

    Joomla 1.5 - 3.4.5 Object Injection RCE X-Forwarded-For header

    Open source ↗
  • GitHub PoCparalelo14/CVE-2015-8562
    First seen Jan 8, 2017

    Joomla 1.5 - 3.4.5 Object Injection RCE X-Forwarded-For header

    Open source ↗
  • GitHub PoCRobinHoutevelts/Joomla-CVE-2015-8562-PHP-POC
    First seen Jan 4, 2016

    A proof of concept for Joomla's CVE-2015-8562 vulnerability

    Open source ↗
  • GitHub PoCZaleHack/joomla_rce_CVE-2015-8562
    First seen Jan 4, 2016

    All versions of the Joomla! below 3.4.6 are known to be vulnerable. But exploitation is possible with PHP versions below 5.5.29, 5.6.13 and below 5.5.

    Open source ↗
  • Exploit-DBEDB-39033
    First seen Dec 18, 2015

    Joomla! 1.5 < 3.4.6 - Object Injection 'x-forwarded-for' Header Remote Code Execution

    Open source ↗
  • Nucleihttp/cves/2015/CVE-2015-8562.yaml
    First seen Jan 1, 2015

    Joomla HTTP Header Unauthenticated - Remote Code Execution

    Open source ↗

Related CVEs(same CWE)

Frequently asked(4)

What is CVE-2015-8562?
CVE-2015-8562 is a high vulnerability published on December 16, 2015. Joomla! 1.5.x, 2.x, and 3.x before 3.4.6 allow remote attackers to conduct PHP object injection attacks and execute arbitrary PHP code via the HTTP User-Agent header, as exploited in the wild in December 2015.
When was CVE-2015-8562 disclosed?
CVE-2015-8562 was first published on December 16, 2015, with the most recent update on May 6, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2015-8562 actively exploited?
CVE-2015-8562 is not currently on CISA's Known Exploited Vulnerabilities catalog. EchelonGraph's EG-KEV model classifies it as weaponized: a functional public exploit exists. FIRST EPSS estimates a 98% probability of exploitation in the next 30 days (99th percentile of EPSS-scored CVEs).
How do I remediate CVE-2015-8562?
No fix for CVE-2015-8562 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix.

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