CVE-2018-15596

MEDIUM ⚠ Exploit

An issue was discovered in inc/class_feedgeneration.php in MyBB 1.8.17. On the forum RSS Syndication page, one can generate a URL such as http://localhost/syndication.php?fid=&type=atom1.0&limit=15...

Affects 1 product across 1 vendor.

CVSS 3.06.1
EPSS2.3%
Percentile83th
PatchPatched
CVSS Vector — Plain English Remotely exploitable over the network, low complexity, no authentication required, requires user interaction, can impact systems beyond the vulnerable component, no availability impact.
CWE Weakness Definitions
CWE-79: Cross-Site Scripting (XSS)

Attacker injects malicious scripts into web pages viewed by other users, executing in the victim's browser context.

Related Attack Patterns (CAPEC)
CAPEC-85 AJAX Footprinting
via CWE-79
CAPEC-209 XSS Using MIME Type Mismatch
via CWE-79
CAPEC-588 DOM-Based XSS
via CWE-79
CAPEC-591 Reflected XSS
via CWE-79
CAPEC-592 Stored XSS
via CWE-79
Show all 6
via CWE-79

Mapping is CWE-to-CAPEC per MITRE CAPEC 3.9.

◆ AI Analysis — automated analysis, not human-reviewed

This vulnerability was disclosed in 2018. A medium severity vulnerability affects Mybb systems (CVE-2018-15596). Public exploit code is available. Isolate affected systems if patching is not feasible.

BSID: BS-2018-GLOBAL-165729-M • Model: rule-based-v1 • Confidence: MEDIUM

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Frequently Asked Questions
What is CVE-2018-15596?
This vulnerability was disclosed in 2018. A medium severity vulnerability affects Mybb systems (CVE-2018-15596). Public exploit code is available. Isolate affected systems if patching is not feasible.
What is the CVSS score for CVE-2018-15596?
CVE-2018-15596 has CVSS 6.1 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N. EPSS: 2.3%.
Is CVE-2018-15596 actively exploited?
Public exploit available for CVE-2018-15596. Exploitation risk elevated.
How do I remediate CVE-2018-15596?
Priority: MONITOR. Advisory: https://blog.mybb.com/2018/08/22/mybb-1-8-18-released-security-maintenance-release/ PSIRT: [email protected]
What systems are affected by CVE-2018-15596?
CVE-2018-15596 affects Mybb Mybb.
Vulnerability Details
CVE IDCVE-2018-15596
BSIDBS-2018-GLOBAL-165729-M BreachSpider Global ID
CVSS VectorCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Published2018-08-28
Last Modified2024-11-21
ICS Relevance0%
Weakness (CWE)
Cross-Site Scripting (XSS)
SourceNVD
Official Description

An issue was discovered in inc/class_feedgeneration.php in MyBB 1.8.17. On the forum RSS Syndication page, one can generate a URL such as http://localhost/syndication.php?fid=&type=atom1.0&limit=15. The thread titles (within title elements of the generated XML documents) aren't sanitized, leading to XSS.

Source: NIST NVD / MITRE CVE Database

Attack Vector Analysis — CITED Relevance

Vulnerability details: An issue was discovered in inc/class_feedgeneration.php in MyBB 1.8.17. On the forum RSS Syndication page, one can generate a URL such as http://localhost/syndication.php?fid=&type=atom1.0&limit=15. The thread titles (within title elements of the generated XML documents) aren't sanitized, leading to XSS. CVSS vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

Exploitation Likelihood: MEDIUM

Affected Products
VendorProductAffected Versions
Mybb Mybb 1.8.17
Remediation
View Vendor Advisory →

Remediation Priority: MONITOR

Vendor PSIRT: [email protected]
Threat Intelligence
● Threat Intelligence Validated: October 2026 | Threat Age: 2970 Days
CISA known-exploitedNot in KEV catalog
Public Exploit⚠ Available — Reference
PoC CodeNot confirmed
AI Enrichment Record — provenance & audit hash
Modelrule-based-v1
ConfidenceMEDIUM
Enriched At2026-05-24
SHA-512 Audit Hash71df48e4df07cfcb71132e2d0c8b6b2f7ab4c5e5f73d620ea945596fb0cc5a272c9029c1f6681222730e83333c7665b82078cd54dcbe1ec08c035491ac5f331c
Related CVEs affecting Mybb
CVE-2015-2786 10.0 Unspecified vulnerability in MyBB (aka MyBulletinBoard) before 1.8.4 has unkn... CVE-2015-8974 10.0 SQL injection vulnerability in the Group Promotions module in the admin contr... CVE-2006-0218 10.0 Multiple unspecified vulnerabilities in MyBulletinBoard (MyBB) before 1.0.2 h... CVE-2011-5133 10.0 Unspecified vulnerability in MyBB before 1.6.5 has unknown impact and attack ... CVE-2016-9402 9.8 SQL injection vulnerability in the moderation tool in MyBB (aka MyBulletinBoa...
View all Mybb CVEs →

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