CVE-2020-36326
No exploitation reported by the sources we read.
- Published2021-04-28
- Fixed in5.7.2 · 5.6.4 · 5.5.5 · 5.4.6 · 5.3.8 · 5.2.11
- WeaknessCWE-502
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
Description
PHPMailer 6.1.8 through 6.4.0 allows object injection through Phar Deserialization via addAttachment with a UNC pathname. NOTE: this is similar to CVE-2018-19296, but arose because 6.1.8 fixed a functionality problem in which UNC pathnames were always considered unreadable by PHPMailer, even in safe contexts. As an unintended side effect, this fix eliminated the code that blocked addAttachment exploitation.
Timeline
dates in UTC- 2021-04-2803:15CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-23 21:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-36326?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-36326?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD · OSV| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 5.7 | ≥ 5.7, < 5.7.2 | 5.7.2 | NVD |
| 5.7 | ≥ 5.7.0, < 5.7.2 | 5.7.2 | OSV |
| 5.6 | ≥ 5.6, < 5.6.4 | 5.6.4 | NVD |
| 5.6 | ≥ 5.6.0, < 5.6.4 | 5.6.4 | OSV |
| 5.5 | ≥ 5.5, < 5.5.5 | 5.5.5 | NVD |
| 5.5 | ≥ 5.5.0, < 5.5.5 | 5.5.5 | OSV |
| 5.4 | ≥ 5.4, < 5.4.6 | 5.4.6 | NVD |
| 5.4 | ≥ 5.4.0, < 5.4.6 | 5.4.6 | OSV |
| 5.3 | ≥ 5.3, < 5.3.8 | 5.3.8 | NVD |
| 5.3 | ≥ 5.3.0, < 5.3.8 | 5.3.8 | OSV |
| 5.2 | ≥ 5.2, < 5.2.11 | 5.2.11 | NVD |
| 5.2 | ≥ 5.2.0, < 5.2.11 | 5.2.11 | OSV |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 6.x | ≥ 6.1.8, ≤ 6.4.0 | no fix published | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 6.x | ≥ 6.1.8, < 6.4.1 | 6.4.1 | OSV |
1 more product in the sources.
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Fix
- Update WordPress to 5.7.2 · 5.6.4 · 5.5.5 · 5.4.6 · 5.3.8 · 5.2.11
Advisories and patches
- github.comPatch
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
- NVDCVSS 3.19.8read 2026-10-23
- NVDCVSS 2.07.5read 2026-10-23
- NVDweakness (CWE)CWE-502read 2026-10-23
- FIRST EPSSEPSS score3.1 %2026-10-23
- OSVaffected packages—
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Published
- 2021-04-28
- Last Modified
- 2026-06-17
- NVD status
- Modified
Frequently asked questions
What is CVE-2020-36326?
Is CVE-2020-36326 actively exploited?
What is the CVSS score for CVE-2020-36326?
Running phpmailer? Hear about its next vulnerability
Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.