CVE-2021-36884: WordPress Backup Migration plugin <= 1.1.5 - Authenticated Persistent Cross-Site Scripting (XSS) vulnerability
Modified
Published 19-11-2021Last modified 28-04-2026
Vulnerability summary
CVE-2021-36884 is a medium (CVSS 5.5) Cross-site Scripting vulnerability in backupbliss backup_migration. EPSS estimates a 0.57% chance of exploitation in the next 30 days, higher than 46.4% of scored vulnerabilities.
CVSS score
5.5/10
010
Medium · v3.1 (wordfence)EPSS score
0.57%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded
Timeline
- 19-11-2021PublishedVulnerability first disclosed.
- 28-04-2026Last modifiedVulnerability information updated.
Description
Authenticated Persistent Cross-Site Scripting (XSS) vulnerability discovered in WordPress Backup Migration plugin <= 1.1.5 versions.
CVSS metrics
4 scores · 3 sources · 2 versionsMedium 5.5Preferred score · wordfence (Source)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:NSources3 sources · 4.8–5.5
- CVE.orgCNA4.8MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:NDiffers
- NVDNIST5.4MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:NDiffers
Low 3.5Preferred score · NVD (NIST)
AV:N/AC:M/Au:S/C:N/I:P/A:NSourcesSingle source
EPSS trend
Probability
0.57%
Chance of exploitation in the next 30 days
Percentile
46%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.57% on 22-09-2026
22-09-202622-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Backupbliss2 products
- backup_migration≤ 1.1.5
- backup migration (wordpress plugin)≥ <= 1.1.5, ≤ 1.1.5
Wordpress1 product
- backup-backup≤ 1.1.5 (fixed in 1.1.6)
2 vendors · 3 products