Critical
Security advisory
Portofino is an open source web development framework. Portofino before version 5.2.1 did not properly verify the signature of JSON Web Tokens. This allows forging a valid JWT. The issue will be patched in the upcoming 5.2.1 release.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2021-29451
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 12:37 UTC · Revision 1
Source evidence
Portofino is an open source web development framework. Portofino before version 5.2.1 did not properly verify the signature of JSON Web Tokens. This allows forging a valid JWT. The issue will be patched in the upcoming 5.2.1 release.
osv:CVE-2021-29451
Complete source record
{
"id": "73520d58bf687a92223e537396bb1eeccef5f22dba0ab88443ca7df0872e0808",
"url": "https://osv.dev/vulnerability/CVE-2021-29451",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2021-29451",
"summary": "Portofino is an open source web development framework. Portofino before version 5.2.1 did not properly verify the signature of JSON Web Tokens. This allows forging a valid JWT. The issue will be patched in the upcoming 5.2.1 release.",
"evidence": "osv:CVE-2021-29451",
"products": [],
"severity": "critical",
"structured": {
"id": "CVE-2021-29451",
"aliases": [
"CVE-2021-29451",
"GHSA-6g3c-2mh5-7q6x"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/manydesigns/portofino",
"type": "GIT",
"events": [
{
"introduced": "3becdfb103086ae47d5a5f3a25699eae86aff359"
},
{
"fixed": "b8d6a89e94d56247186951a45581b40cac20c32a"
},
{
"fixed": "8c754a0ad234555e813dcbf9e57d637f9f23d8fb"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:manydesigns:portofino:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "5.0.0"
},
{
"fixed": "5.2.1"
}
],
"source": "CPE_RANGE"
},
{
"range": [
{
"fixed": "8c754a0ad234555e813dcbf9e57d637f9f23d8fb"
}
],
"source": "REFERENCES_COMMIT"
}
]
}
}
],
"versions": [
"5.2.0",
"5.2-RC1",
"5.1.3",
"5.1.2",
"5.1.1",
"5.1.0",
"5.0.1",
"5.0.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-29451.json",
"vanir_signatures": [
{
"id": "CVE-2021-29451-2560587e",
"digest": {
"length": 715,
"function_hash": "141322969805560288871577444896735620335"
},
"source": "https://github.com/manydesigns/portofino/commit/8c754a0ad234555e813dcbf9e57d637f9f23d8fb",
"target": {
"file": "portofino-core/src/main/java/com/manydesigns/portofino/shiro/AbstractPortofinoRealm.java",
"function": "extractPrincipalFromWebToken"
},
"deprecated": false,
"signature_type": "Function",
"signature_version": "v1"
},
{
"id": "CVE-2021-29451-9cf3eccb",
"digest": {
"threshold": 0.9,
"line_hashes": [
"15900513510547366107223776206875115124",
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"231407925247793714683297951750019516414",
"192259986345102780249517187823404256451",
"307291406416778154578703077818255715550",
"310316670659533062983213146885662735896",
"147042180282165835640744495835920526384",
"241549570988009870386515562068015244831",
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"215504118029276891190797224639299984427",
"218286371992736902393304921606497053630"
]
},
"source": "https://github.com/manydesigns/portofino/commit/8c754a0ad234555e813dcbf9e57d637f9f23d8fb",
"target": {
"file": "portofino-core/src/main/java/com/manydesigns/portofino/shiro/AbstractPortofinoRealm.java"
},
"deprecated": false,
"signature_type": "Line",
"signature_version": "v1"
},
{
"id": "CVE-2021-29451-aa91b60e",
"digest": {
"threshold": 0.9,
"line_hashes": [
"154632233226431257115924754845279259361",
"229101360517188178793922346604677038731",
"282253326813037747866732023504652009785",
"46892763502352582972166688450090913724",
"242727743996252305700707362619988265736",
"87547318534919822325194499934361483454",
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"185997668655876916161753665061404947638",
"222484476783586277386583450790271186081",
"13437620745830202459290455651188957507",
"164237610865250894511345364163710649290",
"24583194819651907583133877699570278367",
"172405037911253773038717583981896429852",
"317343983647700348895365512060822314074",
"158398849797909265704875928922689690583"
]
},
"source": "https://github.com/manydesigns/portofino/commit/8c754a0ad234555e813dcbf9e57d637f9f23d8fb",
"target": {
"file": "dispatcher/src/main/java/com/manydesigns/portofino/dispatcher/security/jwt/JWTRealm.java"
},
"deprecated": false,
"signature_type": "Line",
"signature_version": "v1"
}
],
"vanir_signatures_modified": "2026-10-20T14:02:41Z"
}
}
],
"modified": "2026-10-20T14:02:41.253790306Z",
"provider": "osv",
"references": [
"https://github.com/ManyDesigns/Portofino/security/advisories/GHSA-6g3c-2mh5-7q6x",
"https://mvnrepository.com/artifact/com.manydesigns/portofino",
"https://github.com/ManyDesigns/Portofino/commit/8c754a0ad234555e813dcbf9e57d637f9f23d8fb"
],
"provider_metadata": {}
},
"related_cves": [
{
"value": "CVE-2021-29451",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 388521,
"published_at": "2021-04-16T22:15:14.233+00:00"
}